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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | $ 753,115 | $ 608,909
Gross Unrealized Gains | 16,564 | 2,308
Gross Unrealized Losses | (2,449) | (10,869)
Available-for-sale Securities, Fair Value | 767,230 | 600,348
Held-to-maturity, Amortized Cost | 210,306 | 210,112
Held-to-maturity, Gross Unrealized Gains | 7,546 | 1,853
Held-to-maturity, Gross Unrealized Losses | (134) | (3,692)
Held-to-maturity, Fair Value | 217,718 | 208,273
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 337,336 | 210,386
Gross Unrealized Gains | 11,374 | 1,495
Gross Unrealized Losses | (1,609) | (2,578)
Available-for-sale Securities, Fair Value | 347,101 | 209,303
Held-to-maturity, Amortized Cost | 192,736 | 191,269
Held-to-maturity, Gross Unrealized Gains | 7,335 | 1,773
Held-to-maturity, Gross Unrealized Losses | (99) | (3,366)
Held-to-maturity, Fair Value | 199,972 | 189,676
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 243,366 | 187,563
Gross Unrealized Gains | 3,141 | 625
Gross Unrealized Losses | (424) | (3,185)
Available-for-sale Securities, Fair Value | 246,083 | 185,003
Held-to-maturity, Amortized Cost | 4,714 | 5,144
Held-to-maturity, Gross Unrealized Gains | 11 | 6
Held-to-maturity, Gross Unrealized Losses | (9) | (120)
Held-to-maturity, Fair Value | 4,716 | 5,030
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 144,880 | 183,479
Gross Unrealized Gains | 1,125 | 80
Gross Unrealized Losses | (408) | (4,823)
Available-for-sale Securities, Fair Value | 145,597 | 178,736
Held-to-maturity, Amortized Cost | 12,856 | 13,699
Held-to-maturity, Gross Unrealized Gains | 200 | 74
Held-to-maturity, Gross Unrealized Losses | (26) | (206)
Held-to-maturity, Fair Value | 13,030 | 13,567
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 9,915 | 16,815
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (8) | (208)
Available-for-sale Securities, Fair Value | 9,909 | 16,608
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 17,618 | 10,666
Gross Unrealized Gains | 922 | 107
Gross Unrealized Losses |  | (75)
Available-for-sale Securities, Fair Value | $ 18,540 | $ 10,698

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